There is a problem to install it.
Using version ^0.1.1 for flagrow/amazon-affiliation
./composer.json has been created
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.
- Installation request for flagrow/amazon-affiliation ^0.1.1 -> satisfiable by flagrow/amazon-affiliation[0.1.1].
- flagrow/amazon-affiliation 0.1.1 requires flarum/core ^0.1.0-beta.7 -> satisfiable by flarum/core[0.1.x-dev, v0.1.0-beta.7, v0.1.0-beta.7.1] but these conflict with your requirements or minimum-stability.
Installation failed, deleting ./composer.json.